Producing anthraquinone compounds.



r snares Parana entree,

JOHANN BCNER, 0F LUDWIGSHAFEN-ON-THE-BHINE, GERMANY, ASSIGNOR TO BAIDISCBE ANILIN '& SODA FABRIK, OF' LUDWIGSHAFEN-ON-THE-RHINE,

GERMANY, A CORPORATION.

PRODUCING ANTHRAQUINON E COMPOUNDS.

No Drawing.

T 0 all whom m an; concern.

Be it known that 1, Jonas Borne, Ph. D., chemist, a citizen of the Swiss epublic, residing at Ludwigshafenbathe-Rhine, Germany, have invented new and useful Improvements in Producing-- Anthraquinone Compounds,- of which the following is a specification.

In the Bem'chte (Zer Deuf'schen Chemisciien GeseZZsc/mft, v01. 14 (1881), page e81, it is stated that if anthracene be treated in -.glacial acetic acid solution with nitrogen tetrox1d, anthraqumone can be obtained. I ,have noW discovered that anthraquinone can be obtained in a better mannerythat is to say in a state of greater purity, by treating anthracene at a raised temperature in -the presence of an organic liquid'of the -roxid.' Instead of authracene, derivatives thereof can be oxidized in a similar manner, such for instance as anthracene-2-sulfonic acid and halogenated anth *acene.

The following example will serve to illustrate further the nature of my invention, which, however, is not confined to this-example. The parts are by weight. Mix together one hundred parts of .nitrobenzene Specification of Letters Patent.

Patented Dec. 30, 1913.

' Application filed September20, 1910. SeriaINo. 582,939.

and thirty parts of nitrogen tetroxid, and

introduce twenty-five parts of anthracene,

. While maintaining the temperature at about fifteen. degrees centigrade. Allow the mass to stand for a few hours at ordinary temperature and thenslowlv heat the mixture to about one hundred degrees centigrade. VVhc'n the evolution of nitric oxid has ceased, allow the mixture to cool and filter off and Wash the anthraquinone which is thus obtained in excellent yield and in a satisfactory state of purity. In t'hisexample, instead of anthraeene, a derivative quinoue compound by heating an anthra-..

cenc compound with nitrogen tetroxid in the presence of an organic liquid of the aromatic series.

2. The process of producing anthraquinone by heating anthracene with nitrogen tetroxid in the presence of an organic liquid of the aromatic series."

3. The process ot'producing anthraquinone by heating anthracene with nitrogen tetroxid in the presence of nitrobenzene.

In testimony whereof I have hereunto setmy hand 1n the presence of two subscribing Witnesses. m

. 'JOHAN BONER.

Witnesses:

.J. Anne. LLOYD, Josnr Irnrrrna. 

